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HFC0300 Datasheet(PDF) 17 Page - Monolithic Power Systems

No. de Pieza. HFC0300
Descripción  Variable Off Time Controller
Descarga  21 Pages
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Fabricante  MPS [Monolithic Power Systems]
Página de inicio  http://www.monolithicpower.com
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HFC0300 Datasheet(HTML) 17 Page - Monolithic Power Systems

 
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HFC0300– VARIABLE OFF TIME CONTROLLER
HFC0300 Rev. 1.0
www.MonolithicPower.com
17
9/23/2011
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2011 MPS. All Rights Reserved.
Table 1 Winding Order
Tape(T)
Winding
Edge Tape
(Pri.)
Terminal
(start-end)
Edge Tape
(Sec.)
Wire
size
(φ)
Turns
( T )
1
N1
2mm
3->2
2mm
0.3mm*1
42
1
N2
2mm
5->4
2mm
0.2mm*1
8
3
N3
2mm
9,10->6,7
2mm
0.3mm*5
14
3
N4
2mm
2->1
2mm
0.3mm*1
42
3
Experimental Verification
A physical prototype based on Figure 13 was
used to verify both the design procedure
presented in this application note, and the
performance. The input ranged between 90VAC
and 265VAC, and the output was at 24V/1.5A.
The converter operates in BCM at 90VAC input
and full load. Figure 17 and Figure 18 the current
and drain voltage waveforms of the primary
MOSFET. Figure 19 shows the burst mode
function of the controller at light load.
To minimize power dissipation at no load or light
load, the HFC0300 enters burst-mode operation.
As the load decreases, the COMP voltage
increases. The HF0300 skips switching cycles
when the COMP voltage increases over the
threshold VBURH = 3.2V. The output voltage
drops, causing the COMP voltage to decrease
again.
Once the COMP voltage falls below the threshold
VBURL = 3.1V, switching resumes. The COMP
voltage then rings. The burst mode operation
alternately enables and disables switching cycles
of the MOSFET thereby reducing switching loss
in the no load or light load conditions.
Figure 20 shows over-load protection. When
COMP is low, the controller stops switching after
6000 switching cycles (about 100ms for this
application)
Figure 21 shows the measured efficiency. From
the efficiency curve, the efficiency is still high at
light load condition due to decreased switching
frequency. Also the power consumption at no
load is given in Table 2. In burst mode, the power
loss with no load is very small, even with high
line input.
N1
N2
N3
N4
1T
3T
3T
2mm
Pri. Side
2mm
Sec. Side
1T
Tape: 3T
Figure 16: Winding Diagram


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